bkgrnd(3)
NAME
bkgrnd, wbkgrnd, bkgrndset, wbkgrndset, getbkgrnd, wgetbkgrnd - curses
window complex background manipulation routines
SYNOPSIS
#include <curses.h> int bkgrnd( const cchar_t *wch); int wbkgrnd( WINDOW *win, const cchar_t *wch); void bkgrndset(const cchar_t *wch ); void wbkgrndset(WINDOW *win, const cchar_t *wch); int getbkgrnd(cchar_t *wch); int wgetbkgrnd(WINDOW *win, cchar_t *wch);
DESCRIPTION
The bkgrndset and wbkgrndset routines manipulate the background of the
named window. The window background is a cchar_t consisting of any
combination of attributes (i.e., rendition) and a complex character.
The attribute part of the background is combined (OR'ed) with all nonblank characters that are written into the window with waddch. Both
the character and attribute parts of the background are combined with
the blank characters. The background becomes a property of the character and moves with the character through any scrolling and
insert/delete line/character operations.
To the extent possible on a particular terminal, the attribute part of
the background is displayed as the graphic rendition of the character
put on the screen.
- The bkgrnd and wbkgrnd functions set the background property of the
current or specified window and then apply this setting to every character position in that window:
- The rendition of every character on the screen is changed to the new background rendition.
- Wherever the former background character appears, it is changed to the new background character.
- The getbkgrnd function returns the given window's current background character/attribute pair via the wch pointer.
NOTES
Note that bkgrnd, bkgrndset, and getbkgrnd may be macros.
RETURN VALUES
The bkgrndset and wbkgrndset routines do not return a value.
Upon successful completion, the other functions return OK. Otherwise,
they return ERR. A null window pointer is treated as an error.